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Counting orientations of graphs with no strongly connected tournaments

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Author(s):
Botler, Fabio ; Hoppen, Carlos ; Mota, Guilherme Oliveira ; Ferreira, CE ; Lee, O ; Miyazawa, FK
Total Authors: 6
Document type: Journal article
Source: PROCEEDINGS OF THE XI LATIN AND AMERICAN ALGORITHMS, GRAPHS AND OPTIMIZATION SYMPOSIUM; v. 195, p. 9-pg., 2021-01-01.
Abstract

Let S-k(n) be the maximum number of orientations of an n-vertex graph G in which no copy of K-k is strongly connected. For all integers n, k >= 4 where n >= 5 or k >= 5, we prove that S-k(n) = 2(tk-1(n)) where t(k-1)(n) is the number of edges of the n -vertex (k 1) -partite Turan graph Tk-1(n). Moreover, we prove that Tk-1(n) is the only graph having 2(tk-1(n)) orientations with no strongly connected copies of K-k. (C) 2021 The Authors. Published by Elsevier B.V. (AU)

FAPESP's process: 18/04876-1 - Ramsey theory, structural graph theory and applications in Bioinformatics
Grantee:Guilherme Oliveira Mota
Support Opportunities: Research Grants - Young Investigators Grants
FAPESP's process: 19/13364-7 - Extremal and structural problems in graph theory
Grantee:Cristina Gomes Fernandes
Support Opportunities: Regular Research Grants